[Koleksi Kode Sumber C] (8) : Menghitung luas dan keliling sebuah lingkaran

[Koleksi Kode Sumber C] (8) : Menghitung luas dan keliling sebuah lingkaran

/* P-2.2 */
/* Calculate the area and circumference of a circle
of specified radius */

#include <stdio.h>
#define PI 3.14159
int main(void)
{
double radius, /* input - radius of a circle, cm */
area, /* output - area of a circle, cm^2 */
circumference; /* output - circumference of a circle, cm */
/* Get the radius. */
printf("Enter the radius in cm: ");
scanf("%lf",&radius);
/* Calculate the area and circumference. */
area = PI*radius*radius;
circumference = 2*PI*radius;
/* Display the output. */
printf("The area is %f cm^2.\n",area);
printf("The circumference is %f cm.\n",circumference);
return (0);
}

Sumber : David R. Brooks C Programming: The Essentials for Engineers and Scientists. Springer, NY, 1999